Headboard



FIG. 1 is a right front perspective view of a headboard showing our new design;

FIG. 2 is a side view, the opposite side being a mirror image of the side shown; and,

FIG. 3 is a front elevational view thereof.

The top, bottom and rear views are not shown and form no part of the claimed design. The dotted lines represent environmental elements only, and form no part of the claimed design. 

The ornamental design for a headboard, as shown and described. 